Dual protective device of a heavy-duty stapler

Abstract

The present invention provides a dual protective device of a heavy-duty stapler, in particular to a control device of stapler that controls safely the action of striking slice with spring; of which, a base-controlled active protective device is mounted at rear side of the main body of the stapler, and operated in combination with a manually-operated safety switch that's arranged at front side of the main body of the stapler, thus forming an easy-to-use dual protective device.

1. A dual protective device of heavy-duty stapler, which is composed of upper cover, main body and base; an active protective device is arranged between the rear of the main body and the upper cover, comprising:
 a L-shaped locating block, with a sleeving hole at one side, and a reduced oblique plane at the other side and protruding from the main body; 
 a spring, arranged between the sleeving hole of locating block and lateral plate of the main body; 
 the locating block is located within a groove between a reinforced rib of the upper cover at rear side of the main body; with the extension or compression of the spring, the locating block is driven to shift underneath the upper cover's reinforced rib or groove. 
 
   
   
     2. The device defined in  claim 1 , wherein the oblique plane at one side of said locating block is protruded between the main body and a retracted internal plate of the base. 
   
   
     3. The device defined in  claim 1 , wherein the oblique plane at one side of said locating block is protruded out of the main body when the base is opened. 
   
   
     4. The device defined in  claim 1 , wherein the oblique plane at one side of said locating block is protruded out of the main body when the base is opened.